Portable electric handsaw guideway



Aprii 14, 1953 R. CHAPPELL 2,634,767

PORTABLE ELECTRIC HANDSAW GUIDEWAY Filed Jan. 30, 1951 2 f as 18 9 24 INVENTOR Richard ClzappeLL.

Patented Apr. 14, 1953 UNITED STATES PATENT OFFICE Richard Chappell, Fort Benton, Mont.

Application January 30, 1951, Serial No. 208,475

The present invention relates to a portable hand saw guide for use with substantially all standard type portable electric hand saws.

An object of the invention is to provide a saw guide for standard type portable electric rotary hand saws adapted to be laid upon the work to be sawed and set at any desired angle, to thereby guide the saw across the work at any desired cutting angle.

Another object is to provide a saw guide for a portable hand saw which is very efficient and accurate as it prevents any movement in lateral directions during the longitudinal travel of the saw along the guide.

A further object is to provide a portable saw guide as an article of manufacture formed of a minimum number of parts to provide for economy of manufacture, simplicity in operation and great durability.

With these and other objects in view, the present invention consists in the construction, arrangement and combination'of parts hereinafter described and particularly pointed out in the claims, it being understood that I do not intend to limit myself to the details of construction.

In the drawings, like numerals are employed to designate like parts throughout the same.

Figure 1 is a top perspective view of the present invention, saw guide, with a saw mounted thereon positioned for a start of the sawin operation adjacent a work piece supported on a pair of saw horses.

Figure 2 is a perspective view of a saw, an end of the saw guiding fence and the transverse saw cut squaring bar.

Figure 3 is a top plan view of the saw guide base plate or table with the saw, the guiding fence and the transverse squaring bar removed.

Referring to the drawing and first with particular reference to Figure 1, the present invention comprises an elongated table or plate Ill formed along one side with a straight longitudinal edge l l and formed along the opposite longitudinal edge l2 with a protractor [3. The protractor 13 comprises a segment with a curved peripheral edge I4. The protractor segment is formed by stamping or cutting it out as an integral part of the plate Ill and its peripheral edge curves from one transverse end edge in an arc to a point intermediate the plate 40 on the longitudinal edge l2. From this point the edge 12 of the plate continues in a straight line parallel to the opposite edge I l.

Mounted in alignment with longitudinal edge I2 on the surface of the table or plate I0 is a 2 Claims. (Cl. 143-6) 7 2 novel saw guiding fence l5, formed with a base It, which is secured to the plate In by rivets or the like and an upstanding inverted guide loop !8, see Figure '2. The loop I3 is formed from the material constituting the guiding fence l5 by simply doubling over downwardly the upstanding part of the fence to a distance just above the base plate It. a 5 i The protractor l3 coacts with a work engaging gage bar [9 pivoted to the underside of the plate Ill at the center point with respect to the circumferential or peripheral edge of the protractor segment. l

The pivotal point of the work-engaging gage bar [9 comprises apivot bolt 20 mounted in a countersunk bearing surface formed from-the plate It, and it is adapted to swing to difierent radial positions with respect'to the edge IA of the protractor IS. The protractor edge is notched at spaced apart intervals. The gage-bar I9 has a depending flange 2| which engages against the a bolt 23. Also secured to the gage bar'l9 is'a" plate 24 formed with a tongue '25 which overlaps the surface edge of the protractor. This tongue 25' is formed with an aperture for the-handle bolt 23 to extend through and serves to assist in supporting the gage bar Hi to different adjusted positions over the protractor scale 26. The exterior half of the circumference of the bolt 23 fits in each notch on the protractors edge as the gage bar is adjusted.

One end of the saw fence l5 terminates near the curved protractor end of the plate 10, and transverse the plate In at this end is an angle ironsaw squaring bar 21. This angle iron bar 21 is formed with an opening 29 and the bar extends transversely at right angles from an edge 28 cut back with respect to the longitudinal edge I I of plate It, see Figure 3. The inner surface of bar 21 serves as a square to position the squared end of a saw carriage base 30 and the saw 34 parallel to the edge I l of the saw table II].

Any standard rotary hand saw may be mounted for use on the table I t and as shown in Figure 2 such saws include the usual carriage base 30 on which is mounted an electric motor 3| with operating handle 32 and a switch control 33. The saw 34 is driven from the armature shaft of the motor and extends downward vertically below the base 30 from within the hood guard 35.

In prior structures the saw fence or longitudinal saw guide has no provision for prevention of lateral movement of the saw during operation or for initially squaring the saw at the starting position. However, with my invention lateral movement is prevented by the novel construction of the fence or saw guide I5, which has the loop I8 for this purpose in combination with a guide yoke 31 vertical with respect to the saw base 39 and squaring is provided by means of the le a 2 arranged to square again the transverse squared rear edge of the saw base 30, see Figure 2.

The'saw base 30 has a pilot positioning bar 36 adapted to project through the angle bar 21 in opening 29 after the saw carriage has been retracted along the plate It) to star ng position.

The saw guide yoke 31 is formed with apertured right angled feet 38 and 33 at each end, which serve to secure the yoke to the upper surface of the saw base 30 with the nut and bolts 4'0.

Operation From he. for g in des r ption the. se oi he device should e apparent, For e ample, the ease bar 11 is s to a y e red u n an le on: th protractor cale 6. the w carria e with he ui e oke 3 slidin the u de l op l8 sretracted ainst t e s uare. a 2 Then the saw table III is rested on a piece of work with efiah e 2 he a e. bar enga in theed e of; t e or s'. assh wn n ur Thelectric. saw otor-pow r jack 4| on a 315 plu e n o o er outlet 2 o the. ike and the circuit is completed when desired by the switch 33,. As the motor is energized and the awblade 34 is r t ted, the opera or s mply gsaw guideoompris ne elongated pla e 4 carried by a saw with a carriage base slidable thereover, said plate having a longitudinal edge along which the saw blade travels and having a second longitudinal edge formed with a guide loop, said loop slidably embracing a guide yoke carried by the saw carriage base, whereby said guide plate, said guide loop and said loop embraced saw carried guide yoke may be handled to e her s one u nd. stop memb r tran e e J1 end of S i ide p a e; adap d 0 maintain the said guide loop in saw guide yoke embracing position at the end of the guide plate and serving as a squared starting point for the saw, said'stop, member being formed with an opening adapted to receive a bar carried by the said saw carriage base when the saw is in retracted position at the end of the guide plate.

2. A saw guide comprising an elongated plate carried by a saw with a carriage base slidable thereover, said plate having a longitudinal edge along which the saw blade travels. and havin a seco d on itudi al e f rmed with a guid loop, said 100p slidably embracing a guide yoke carriedby the saw carriage base, whereby said guide plate, said guide loop and said loop em-. braced saw carried guide yoke may be handled together as one unit and a stop member trans, verse an end of said guide plate adapted to.-ma in tain the said guide loop in saw guide yoke em-v bracing position at the end of the guide plate and serving as a squared starting point for the saw and 'a protractor and gauge bar carried bysaid guide plate for angularly positioning the saw carried guide plate with respect tovthe work to be sawed.

RICHARD, CHAPBELL.

ef en Ci e n the file of this patent. UNITED STATES PATENTS 

